FFmpeg
blockdsp_init.c
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1 /*
2  * Copyright (c) 2024 Institue of Software Chinese Academy of Sciences (ISCAS).
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "config.h"
22 
23 #include "libavutil/attributes.h"
24 #include "libavutil/cpu.h"
25 #include "libavutil/riscv/cpu.h"
26 #include "libavcodec/blockdsp.h"
27 
28 void ff_clear_block_rvv(int16_t *block);
29 void ff_clear_blocks_rvv(int16_t *block);
30 void ff_fill_block16_rvv(uint8_t *block, uint8_t value, ptrdiff_t line_size,
31  int h);
32 void ff_fill_block8_rvv(uint8_t *block, uint8_t value, ptrdiff_t line_size,
33  int h);
34 
36 {
37 #if HAVE_RVV
38  int flags = av_get_cpu_flags();
39 
41  c->clear_block = ff_clear_block_rvv;
42  c->clear_blocks = ff_clear_blocks_rvv;
43  c->fill_block_tab[0] = ff_fill_block16_rvv;
44  c->fill_block_tab[1] = ff_fill_block8_rvv;
45  }
46 #endif
47 }
blockdsp.h
ff_blockdsp_init_riscv
av_cold void ff_blockdsp_init_riscv(BlockDSPContext *c)
Definition: blockdsp_init.c:35
av_get_cpu_flags
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:107
ff_clear_block_rvv
void ff_clear_block_rvv(int16_t *block)
BlockDSPContext
Definition: blockdsp.h:32
ff_clear_blocks_rvv
void ff_clear_blocks_rvv(int16_t *block)
av_cold
#define av_cold
Definition: attributes.h:90
ff_rv_vlen_least
static bool ff_rv_vlen_least(unsigned int bits)
Checks that the vector bit-size is at least the given value.
Definition: cpu.h:65
cpu.h
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
cpu.h
ff_fill_block16_rvv
void ff_fill_block16_rvv(uint8_t *block, uint8_t value, ptrdiff_t line_size, int h)
attributes.h
value
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default value
Definition: writing_filters.txt:86
ff_fill_block8_rvv
void ff_fill_block8_rvv(uint8_t *block, uint8_t value, ptrdiff_t line_size, int h)
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:482
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
h
h
Definition: vp9dsp_template.c:2070
AV_CPU_FLAG_RVV_I64
#define AV_CPU_FLAG_RVV_I64
Vectors of 64-bit int's *‍/.
Definition: cpu.h:94